/*----------------------------------------------------------------------------
 * Copyright (c) <2013-2015>, <Huawei Technologies Co., Ltd>
 * All rights reserved.
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 * 1. Redistributions of source code must retain the above copyright notice, this list of
 * conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright notice, this list
 * of conditions and the following disclaimer in the documentation and/or other materials
 * provided with the distribution.
 * 3. Neither the name of the copyright holder nor the names of its contributors may be used
 * to endorse or promote products derived from this software without specific prior written
 * permission.
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *---------------------------------------------------------------------------*/
/*----------------------------------------------------------------------------
 * Notice of Export Control Law
 * ===============================================
 * Huawei LiteOS may be subject to applicable export control laws and regulations, which might
 * include those applicable to Huawei LiteOS of U.S. and the country in which you are located.
 * Import, export and usage of Huawei LiteOS in any manner by you shall be in compliance with such
 * applicable export control laws and regulations.
 *---------------------------------------------------------------------------*/

#ifndef __HISOC_SPI_H__
#define __HISOC_SPI_H__

#include "asm/platform.h"
#include "hisoc/clock.h"
#include "asm/io.h"

#ifdef __cplusplus
#if __cplusplus
extern "C" {
#endif /* __cplusplus */
#endif /* __cplusplus */

#define SPI_CLK_RATE   100000000

#define SPI0_ENABLE 1
#define SPI1_ENABLE 1

#define SPI0_NUM_CS     1
#define SPI1_NUM_CS     2

#define REG_CRG_SPI           (CRG_REG_BASE + 0x01bc)

#define REG_MISC_CTRL_SPI           (MISC_REG_BASE + 0)

#define MISC_CTRL_SPI1_CS_SHIFT        (2)
#define MISC_CTRL_SPI1_CS              (0x1 << MISC_CTRL_SPI1_CS_SHIFT) /* 00:cs0, 01:cs1 */

static inline int spi_cfg_cs(uint16_t bus_num, uint8_t csn)
{
    unsigned int value;
    switch (bus_num) {
        case 0:
            if ((csn + 1) > SPI0_NUM_CS) {
                PRINT_ERR("%s, %s, %d line: error\n",
                          __FILE__, __func__, __LINE__);
                return -1;
            }
            break;

        case 1:
            if (csn < SPI1_NUM_CS) {
                value = readl(REG_MISC_CTRL_SPI);
                value &= ~MISC_CTRL_SPI1_CS;
                value |= (csn << MISC_CTRL_SPI1_CS_SHIFT);
                writel(value, REG_MISC_CTRL_SPI); /* set spi1 csn */
            } else {
                PRINT_ERR("%s, %s, %d line: error\n",
                          __FILE__, __func__, __LINE__);
                return -1;
            }
            break;

        default:
            PRINT_ERR("%s, %s, %d line: error\n",
                      __FILE__, __func__, __LINE__);
            return -1;

    }
    return 0;
}

static inline int spi_hw_init_cfg(uint16_t bus_num)
{
    switch (bus_num) {
        case 0:
            write_reg_bit(1, 12, REG_CRG_SPI); /* open spi0 clk */
            write_reg_bit(0, 15, REG_CRG_SPI);
            break;

        case 1:
            write_reg_bit(1, 13, REG_CRG_SPI); /* open spi1 clk */
            write_reg_bit(0, 16, REG_CRG_SPI);
            break;

        default:
            PRINT_ERR("%s, %s, %d line: error\n",
                      __FILE__, __func__, __LINE__);
            return -1;
    }
    return 0;
}

static inline int spi_hw_exit_cfg(uint16_t bus_num)
{
    switch (bus_num) {
        case 0:
            write_reg_bit(1, 15, REG_CRG_SPI);
            write_reg_bit(0, 12, REG_CRG_SPI); /* close spi0 clk */
            break;

        case 1:
            write_reg_bit(1, 16, REG_CRG_SPI);
            write_reg_bit(0, 13, REG_CRG_SPI); /* close spi1 clk */
            break;

        default:
            PRINT_ERR("%s, %s, %d line: error\n",
                      __FILE__, __func__, __LINE__);
            return -1;
    }
    return 0;
}

#ifdef __cplusplus
#if __cplusplus
}
#endif /* __cplusplus */
#endif /* __cplusplus */

#endif

